JP3430496B2 - Bath heating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath heater for forcibly circulating hot and cold water in a bath tub by a pump to prevent the heat exchanger from being boiled off. 2. Description of the Related Art Conventionally, in a bath heating apparatus having a pump for forcibly circulating bath water and a water flow switch for detecting a circulating water flow, water or hot water is dropped into a bath tub as shown in FIG. Thereafter, when reheating the bath water, if the reheating switch provided on the remote controller or the like is turned ON (S2).
1) The pump provided in the circulation path is driven (S2)
2). At this time, if the water flow switch does not detect the water flow, it is determined that there is a problem in the pipe or there is no water up to the position of the circulation fitting, and the pump is turned off and the process ends (S26).
If the pump is normal, a circulating water flow is generated by driving the pump. The circulating water flow is detected by the water flow switch (S23), the burner is instructed to start heating, and reheating is performed to the set temperature (S24). When the temperature reached the set temperature, the pump was turned off, the water flow switch was turned off, and the reheating was stopped. [0003] However, the water flow switch for detecting the circulating water flow has a switch O due to dust or the like.
If a failure occurs in the N state, turn on the reheating switch to O.
If N, it is determined that a water flow has occurred, so the burner is ignited to heat the heat exchanger. If the bathtub water level is too low to generate a circulating water flow, the heat source unit will be empty-fired. Had the problem of getting lost. Accordingly, the present invention solves the above-mentioned drawbacks of the prior art and provides a bath heating apparatus in which a pump, a heat exchanger, and a water flow switch are provided in a circulation path and which reliably prevents the heat exchanger from being idled. It is intended to be provided. [0005] In order to achieve the above object, a bath heating apparatus of the present invention is provided with a water flow switch in a circulation path for forcibly circulating bath water and a pump and is heated by a burner. It is provided with a heat exchanger, and has a circulation judging means for judging the presence or absence of bathtub water by ON operation of a water flow switch driven by a pump, and after the circulation judgment by the circulation judging means, heats the bathtub water. Mode with a reheating switch.
A water flow switch check means for applying a voltage to the water flow switch to check the conduction of the water flow switch when the pump is stopped, and to keep the water flow switch conductive for a certain period of time.
If so, the water flow switch is broken
Performs display, when the water flow switch is non-conducting is characterized in that a control means shifts to additional heating mode. [0006] The presence of bathtub water is detected by turning on a water flow switch driven by a pump, and the additional heating mode in which the burner is heated by the detection, and an additional instruction for executing the additional heating mode.
Apply voltage to the water flow switch by operating the fire switch
A water flow switch check means for checking whether the water flow switch is conducting when the pump is stopped, and a water flow switch.
If there is continuous conduction for a certain period of time, the water flow switch
By providing a failure indication that a failure has occurred and by providing control means for shifting to the additional heating mode when the water flow switch is non-conducting, it is possible not only to detect residual water in the bathtub but also to detect failure of the water flow detection means. Erroneous determination can be detected, and the effect of preventing the empty heat of the heat exchanger is doubled,
Safety can be further improved. FIG. 1 is a diagram showing a configuration of a bath heating device.
The bath heating device is connected to the bathtub 1, and a circulation path 2 connected to the bathtub 1 includes a pump 3 for circulating hot water, a temperature sensor 4 for detecting hot water temperature, and a water flow switch 5 for detecting water flow. A heat exchanger 6 heated by a burner 7,
A water level sensor D is provided. Reference numeral 8 denotes an electromagnetic valve that supplies gas to the burner 7 when opened. Reference numeral 9 denotes a dropping hot water supply path connected to the circulation path 2, which is provided with a flow rate sensor 10 for detecting a flow rate of hot water supplied from another hot water supply heat source (not shown) and dropped into the bathtub 1, and a water solenoid valve 11. I have. Reference numeral 12 denotes a controller for controlling a controlled device such as the pump and the solenoid valve, and reference numeral 13 denotes a remote controller. The remote controller 13 has a reheating switch 14, a temperature setting device 15 for setting the temperature of hot water in the bathtub, an automatic hot water filling switch 16, and a water level setting device 17 for setting the water level of the bathtub water.
And a display unit 18 for displaying an operation status, a failure location, and the like.
And are arranged. FIG. 2 is a flowchart showing the contents of the reheating control according to the present invention, and FIG. 3 is an explanatory diagram of the operation of the check means of the water flow switch. The control of the present invention will be described with reference to FIGS. I do. At the time of bathing, a desired hot water temperature and a desired amount of hot water are dropped into the bathtub 1 through the drop hot water supply path 9 and the circulation path 2. After bathing, the temperature of the hot water drops, so additional firing is required. In the present invention, immediately after the reheating switch 14 is turned on (S1), the presence or absence of conduction of the water flow switch 5 is checked (S2). Water flow switch inspection means A for checking whether the water flow switch 5 is conductive or not.
Is shown in FIG. 3, reference numeral 5 denotes a water flow switch provided in the circulation path 2, and reference numeral 20 denotes a microcomputer. Water flow switch 5 is flapper 5a
, A magnet 5b attached to the flapper 5a, and a magnetic proximity switch 5c. P is a port of the microcomputer. Since the water flow has not yet occurred when the Vcc power supply is applied, when the water flow switch 5 is normal, the magnet 5b of the flapper 5a is located away from the magnetic proximity switch 5c as shown in the drawing. The magnetic proximity switch 5c is off, and no voltage is applied to the port P of the microcomputer 20. However, the water flow switch 5
If the flapper 5a is located at the upper position in the figure due to dust or hair clogging and is kept close to the magnetic proximity switch 5c, the magnetic proximity switch 5
c is conducted by the magnet 5b, so that the microcomputer 2
A voltage is applied to the port P of 0. Therefore, by reading the signal of the port P of the microcomputer 20 connected to the magnetic proximity switch 5c of the water flow switch 5, the water flow switch 5
Can be checked for conduction. After checking whether the water flow switch 5 is conductive or not by the water flow switch inspection means A, if the water flow switch 5 is ON, a timer is started (S8), and if the time is up (S9), the water flow switch 5 fails. Is displayed on the display unit 18 of the remote controller. After checking whether the water flow switch 5 is conducting, if the water flow switch 5 is off, the pump 3 is driven (S
3). When there is water in the bathtub 1 by driving the pump 3, a water flow is generated in the circulation path 2. When a water flow occurs in the circulation path 2,
The flapper 5a of the water flow switch 5 rotates and the magnetic proximity switch 5c is turned ON (S4). Thus, the circulation determining means for determining the presence or absence of bathtub water by turning on the water flow switch 5 is provided. When the pump 3 is turned on and an input signal is input to the port P of the microcomputer 20, the electromagnetic valve 8 in the gas passage to the burner 7 opens (S5), and the bathtub water is heated via the heat exchanger 6. The mode in which the bathtub is heated after the circulation determining means determines that the bathtub is full of water is referred to as a reheating mode. Thereafter, when the bathtub water temperature detected by the temperature sensor 4 becomes equal to or higher than the set temperature (S6), the solenoid valve 8 is closed to stop the burner combustion, and the pump 3 is turned off to stop. Further, the pump 3 is turned off and stopped. Also,
Despite driving pump 3, water flow switch 5
When is not ON, that is, when there is no hot water up to the position of the circulating bracket in the bathtub or when the water flow switch itself is OFF and malfunctions, the timer is started (S11).
If the timer is up after a certain period of time (S12), the pump 3 is stopped and a failure is displayed on the display unit 18. The present invention has the above-described configuration and operation,
According to the bath heating device of the first aspect, the circulation determination means for determining the presence or absence of bathtub water by ON operation of the water flow switch driven by the pump, and after the circulation determination by the circulation determination means,
It has a reheating mode for heating the bath water, additional heating switch
Switch to apply a voltage to the water flow switch.
The water flow switch check means for checking the presence or absence of conduction of the water flow switch in the flop stopped provided, when the water flow switch is constant
If the water flow switch has failed, the
In addition to providing a failure indication that the water flow switch is off, the control means that shifts to the reheating mode when the water flow switch is non-conductive is provided. False detection can be detected,
This is a double safety measure of empty heating due to no remaining water and empty heating due to ON failure of the water flow switch, and has the effect of further improving safety.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. FIG. 2 is a flowchart illustrating a control example of the present invention. FIG. 3 is an operation explanatory view of a check means of a water flow switch. FIG. 4 is a flowchart illustrating a control example of the related art. [Description of Signs] 1 Bathtub 2 Circulation path 3 Pump 5 Water flow switch 6 Heat exchanger 7 Burner 14 Reheating switch A Water flow switch inspection means

Claims (1)

(1) A water flow switch is provided in a circulation path for forcibly circulating hot and cold bath water by a pump, and a heat exchanger heated by a burner is provided. has a circulation determination means for determining whether the bath water by the ON operation of the water flow switch by, after circulating determination by circulating determining means, in those having a reheating mode for heating of bathtub water, the water flow by operating the reheating switch switch
If the water flow switch is continuously conducting for a certain period of time , a water flow switch inspection means is provided to apply voltage to the water flow switch and check whether the water flow switch is conductive when the pump is stopped .
When a fault indication indicating that the water flow switch is
Both bath heating apparatus characterized in that a control means shifts to reheating mode when the water flow switch is non-conductive.